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The free volume in thin films of poly(N‐isopropylacrylamid) end‐capped with n‐butyltriocarbonate (nbc‐PNIPAM) is probed with positron annihilation lifetime spectroscopy (PALS). The PALS measurements are performed as function of energy to obtain depth profiles of the free volume of nbc‐PNIPAM films. The range of nbc‐PNIPAM films with thicknesses from 40 to 200 nm is focused. With decreasing film thickness...
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